A nurse holds the hands of a person suffering from Alzheimer's disease on September 21, 2009 at Les Fontaines retirement home in Lutterbach , eastern France. Scientists working in seven countries announced last week they had uncovered variants of three genes which play a role in Alzheimer's, a discovery that should throw open many new avenues for tackling this mind-killing disease. AFP PHOTO / SEBASTIEN BOZON (Photo credit should read SEBASTIEN BOZON/AFP/Getty Images)
{}